Tilting apparatus



Sept. 6, 1938. SCHLESlNGEfi 2,129,036

I TILTING APPARATUS Original Filed July 11, 1953 Jm'en/or:

Patented Sept. 6, 1938 PATENT GFFEQE TILTKNG APPARATUS Kurt Schlesinger,Berlin, Germany, assignor to Radicaktiengesellschait D. S. Loewe,Berlin- Steglitz, Germany Original application July 11, 1933, Serial No.

Patent No. 2,053,536, dated Septemher 8, 1936. Divided and thisapplication January 13, 1936, Serial No. 58,952. In Germany July 15,1932 1 Claim.

In the parent application Ser. No. 679,866, filed July 11, 1933, Patent#2,053,536 dated Sept. 8, 1936 of which the present case is a divisionalapplication, I have described a method and an arrangement of producingrelaxation oscillations making use of screening grid tubes furnishedwith an interception grid. The use of screening grid tubes enablescharging tubes with saturated emission and tungsten cathodes otherwiseunavoidable in connection with relaxation oscillation generators to bedispensed with.

Even if in the manner described the constancy of the charging current isensured within a wide range of the anode potential, there is still to beobserved with sufficient accuracy of measurement a delay in theignition.

The present invention shows a method and an arrangement for producingrelaxation oscillations which enable relaxation potentials to beobtained which are linearly ascending. I have found out that thedisadvantage of the generators used up to now, with regard tonon-linearity is due to the fact that the load of the consumingapparatus connected to the output of said generators causes distortion.This will be removed by the method according to the present invention.

The novel features, which I believe to be characteristic of myinvention, are set forth with particularity in the appended claim. Myinvention, however, both as to its organization and method of operationtogether with further objects and advantages may be best understood byreference to the following description taken in connection with theaccompanying drawing in which the figure represents an embodiment of myinvention.

In the drawing l is a charging valve, the oath-- ode of which isindirectly heated, by a main current transformer 2. 6 is a condenserwhich is charged by the direct current potential source 3 through themedium of said valve. it is a glow discharge device for discharging saidcondenser, in case the charging potential of said condenser has reachedthe ignition potential of said glow discharge device. The charging valvemay be furnished with a screen grid 4 and a further control griddetermining the strength of charging current through said valve bysuitably biassing said grid by means of the bias battery 5. The delayvin ignition above referred to is due to the fact that at the chargingcondenser 6 a load requires to be connected between the terminals 1, 8.This load is represented in the present instance by an ohmic resistanceM. A

bias battery 9 is connected between one electrode of the dischargedevice and terminal 8, the bias of which is adjusted to the centre pointof oscillation, so that the potential between "I and 8 oscillates to anequal extent into positive and negative. The load it in the dischargephase of the condenser then makes itself noticeable by acceleration ofthe discharge, because the terminal 8 is then more negative than theterminal I, and an auxiliary charging current accordingly flows over theresistance Hi, whilst the load near the ignition makes itself apparentin the form of an obstruction, because in this case a leakage currentflows in the opposite direction from "i to 8.

Now it has been found very convenient, particularly for televisionpurposes, to make use of methods, which permit of correction at will ofthese small remaining errors.

Certain methods of this kind are set forth in the following: The figure,for example, shows a correction at the grid of the charging tube I bythe grid bias correcting resistance 15 according to the invention. Thepotential of the inner grid it of the screening grid charging tube l isbiassed as compared with the cathode of the same tube to the extent ofthe drop in potential produced by the charging current through the tubel at the resistance l5. If now owing to excessive compensation of thepotentials of anode and protective network, or secondary emis sion inthe tube 1, etc., a decrease of this charging current takes place roundabout the ignition moment, the same simultaneously makes itself apparentby a reduction in the negative bias of the grid iii, as the chargingcurrent itself creates this bias at the resistance It. The grid becomesless negative, and a sinking of the anode current is thus compensated.The degree of compensation may be adjusted by the fact that, as shown,the resistance 65 may be varied.

I claim:

A generator for producing relaxation oscillations of saw tooth form withrectilinear rise com-- prising a direct current source, a condenser, anelectronic valve for charging periodically said condenser with aconstant current intensity having cathode, control grid, screening gridand anode and a discharge tube for discharging periodically saidcondenser, a second D. 0. potential source for biassing said controlgrid with respect to said cathode and a variable resistance, oneelectrode of said condenser being connected to the positive terminal ofsaid source and to one electrode of said discharge tube, the otherelectrode of said condenser being connected to said anode and to thesecond electrode of said discharge tube, said cathode being connectedover said resistance to the negative terminal of said source, saidscreening grid being connected to a tapping point of said source belowsaid anode potential, one terminal of said second potential source beingconnected to the negative terminal of said first potential source, theother terminal of said second potential source being connected to saidcontrol grid.

KURT SCHLESINGER.

